package com.platform.utils;

import com.platform.entity.ColumnEntity;
import com.platform.entity.TableEntity;
import java.io.File;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import org.apache.commons.configuration.Configuration;
import org.apache.commons.configuration.ConfigurationException;
import org.apache.commons.configuration.PropertiesConfiguration;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;

/**
 * 代码生成器   工具类
 *
 * @author lipengjun
 * @email 939961241@qq.com
 * @date 2017年1月3日 下午6:35:28
 */
public class GenUtils {

  public static List<String> getTemplates() {
    List<String> templates = new ArrayList<String>();
    templates.add("template/Entity.java.vm");
    templates.add("template/Example.java.vm");
    templates.add("template/Mapper.java.vm");
    templates.add("template/Mapper.xml.vm");
    templates.add("template/Service.java.vm");
    templates.add("template/ServiceImpl.java.vm");
    templates.add("template/Controller.java.vm");
    templates.add("template/list.html.vm");
    templates.add("template/list.js.vm");
    templates.add("template/menu.sql.vm");
    return templates;
  }

  /**
   * 生成代码
   */
  public static void generatorCode(Map<String, String> table,
      List<Map<String, String>> columns, ZipOutputStream zip) {
    //配置信息
    Configuration config = getConfig();

    //表信息
    TableEntity tableEntity = new TableEntity();
    tableEntity.setTableName(table.get("tableName"));
    tableEntity.setComments(table.get("tableComment"));
    //表名转换成Java类名
    String className = tableToJava(tableEntity.getTableName(), config.getString("tablePrefix"));
    tableEntity.setClassName(className);
    tableEntity.setClassname(StringUtils.uncapitalize(className));

    //列信息
    List<ColumnEntity> columsList = new ArrayList<>();
    for (Map<String, String> column : columns) {
      ColumnEntity columnEntity = new ColumnEntity();
      columnEntity.setColumnName(column.get("columnName"));
      columnEntity.setDataType(column.get("dataType"));
      columnEntity.setComments(column.get("columnComment"));
      columnEntity.setExtra(column.get("extra"));

      //列名转换成Java属性名
      String attrName = columnToJava(columnEntity.getColumnName());
      columnEntity.setAttrName(attrName);
      columnEntity.setAttrname(StringUtils.uncapitalize(attrName));

      //列的数据类型，转换成Java类型
      String attrType = config.getString(columnEntity.getDataType(), "String");
      columnEntity.setAttrType(attrType);

      //是否主键
      if ("ORACLE".equals(Constant.USE_DATA)) {
        if ((column.get("columnName").equalsIgnoreCase(column.get("columnKey"))
            && tableEntity.getPk() == null)) {
          tableEntity.setPk(columnEntity);
        }
      } else {
        if (("PRI".equalsIgnoreCase(column.get("columnKey")) && tableEntity.getPk() == null)) {
          tableEntity.setPk(columnEntity);
        }
      }

      columsList.add(columnEntity);
    }
    tableEntity.setColumns(columsList);

    //若没主键
    if (tableEntity.getPk() == null) {
      //设置columnName为id的为主键
      boolean flag = true;
      for (ColumnEntity columnEntity : tableEntity.getColumns()) {
        if ("id".equals(columnEntity.getAttrname())) {
          tableEntity.setPk(columnEntity);
          flag = false;
          break;
        }
      }
      //若无id字段则第一个字段为主键
      if (flag) {
        tableEntity.setPk(tableEntity.getColumns().get(0));
      }
    }

    //设置velocity资源加载器
    Properties prop = new Properties();
    prop.put("file.resource.loader.class",
        "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
    Velocity.init(prop);

    //封装模板数据
    Map<String, Object> map = new HashMap<>();
    map.put("tableName", tableEntity.getTableName());
    map.put("comments", tableEntity.getComments());
    map.put("pk", tableEntity.getPk());
    map.put("className", tableEntity.getClassName());
    map.put("classname", tableEntity.getClassname());
    map.put("pathName", tableEntity.getClassname().toLowerCase());
    map.put("columns", tableEntity.getColumns());
    map.put("package", config.getString("package"));
    map.put("author", config.getString("author"));
    map.put("email", config.getString("email"));
    map.put("datetime", DateUtils.format(new Date(), DateUtils.DATE_TIME_PATTERN));
    VelocityContext context = new VelocityContext(map);

    //获取模板列表
    List<String> templates = getTemplates();
    for (String template : templates) {
      //渲染模板
      StringWriter sw = new StringWriter();
      Template tpl = Velocity.getTemplate(template, "UTF-8");
      tpl.merge(context, sw);

      try {
        //添加到zip
        zip.putNextEntry(new ZipEntry(
            getFileName(template, tableEntity.getClassName(), config.getString("package"))));
        IOUtils.write(sw.toString(), zip, "UTF-8");
        IOUtils.closeQuietly(sw);
        zip.closeEntry();
      } catch (IOException e) {
        throw new RRException("渲染模板失败，表名：" + tableEntity.getTableName(), e);
      }
    }
  }


  /**
   * 列名转换成Java属性名
   */
  public static String columnToJava(String columnName) {
    return WordUtils.capitalizeFully(columnName, new char[]{'_'}).replace("_", "");
  }

  /**
   * 表名转换成Java类名
   */
  public static String tableToJava(String tableName, String tablePrefix) {
    if (StringUtils.isNotBlank(tablePrefix)) {
      tableName = tableName.replace(tablePrefix, "");
    }
    return columnToJava(tableName);
  }

  /**
   * 获取配置信息
   */
  public static Configuration getConfig() {
    try {
      return new PropertiesConfiguration("generator.properties");
    } catch (ConfigurationException e) {
      throw new RRException("获取配置文件失败，", e);
    }
  }

  /**
   * 获取文件名
   */
  public static String getFileName(String template, String className, String packageName) {
    String packagePath = "main" + File.separator + "java" + File.separator;
    if (StringUtils.isNotBlank(packageName)) {
      packagePath += packageName.replace(".", File.separator) + File.separator;
    }

    if (template.contains("Entity.java.vm")) {
      return packagePath + "entity" + File.separator + className + "Entity.java";
    }

    if (template.contains("Example.java.vm")) {
      return packagePath + "entity" + File.separator + "example" + File.separator + className
          + "Example.java";
    }

    if (template.contains("Mapper.java.vm")) {
      return packagePath + "dao" + File.separator + className + "Mapper.java";
    }

    if (template.contains("Mapper.xml.vm")) {
      return packagePath + "dao" + File.separator + className + "Mapper.xml";
    }

    if (template.contains("Service.java.vm")) {
      return packagePath + "service" + File.separator + className + "Service.java";
    }

    if (template.contains("ServiceImpl.java.vm")) {
      return packagePath + "service" + File.separator + "impl" + File.separator + className
          + "ServiceImpl.java";
    }

    if (template.contains("Controller.java.vm")) {
      return packagePath + "controller" + File.separator + className + "Controller.java";
    }

    if (template.contains("list.html.vm")) {
      return "main" + File.separator + "webapp" + File.separator + "WEB-INF" + File.separator
          + "page"
          + File.separator + "shop" + File.separator + className.toLowerCase() + ".html";
    }

    if (template.contains("list.js.vm")) {
      return "main" + File.separator + "webapp" + File.separator + "js" + File.separator + "shop"
          + File.separator + className.toLowerCase() + ".js";
    }

    if (template.contains("menu.sql.vm")) {
      return className.toLowerCase() + "_menu.sql";
    }

    return null;
  }
}
